CN102984431B - Image forming apparatus and control method thereof - Google Patents
Image forming apparatus and control method thereof Download PDFInfo
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- CN102984431B CN102984431B CN201210323484.4A CN201210323484A CN102984431B CN 102984431 B CN102984431 B CN 102984431B CN 201210323484 A CN201210323484 A CN 201210323484A CN 102984431 B CN102984431 B CN 102984431B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/55—Self-diagnostics; Malfunction or lifetime display
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/401—Compensating positionally unequal response of the pick-up or reproducing head
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/00025—Machine control, e.g. regulating different parts of the machine
- G03G2215/00029—Image density detection
- G03G2215/00067—Image density detection on recording medium
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
- G03G2215/00535—Stable handling of copy medium
- G03G2215/00611—Detector details, e.g. optical detector
- G03G2215/00616—Optical detector
Abstract
The invention relates to an image forming apparatus and control method thereof .According to the embodiments of the invention, the problem to be solved is whether errors have occurred for color sensors for calibrating density and color or their corresponding reference plates. At step S103, it is determined whether the difference is larger than a predefined threshold. If so, the sensors are determined abnormal; otherwise, it is normal. At step S111, color sensors 50a, 50b, 50c, and 50d read the density of recording medium 11 on at least one of its coordinates, compares the readings of sensors determined abnormal with that of sensors determined normal, and determines whether the difference obtained at step S112 is within the predefined threshold. At step S114, for color sensors determined abnormal at step S103, an abnormity alarm message is displayed on a UI as shown in FIG. 8 or sent to the user via e-mail.
Description
Technical field
The present invention relates to image forming apparatus and the method for calibrating concentration and color, and particularly relate to the image forming apparatus of such as duplicator or printer etc. and the method for calibrating concentration and color.
Background technology
Electrophotography is considered to one of image record scheme that the such as image forming apparatus such as duplicator or printer uses.For electrophotography, first use laser beam to form sub-image in photosensitive drums, then utilize charged look material (hereinafter also referred to as " toner ") to develop this image.Then the image utilizing toner to develop is transferred and is fixed on transfer paper, and is recorded as final image.In recent years, occurred tandem electrophotographic image-forming apparatus many especially, these image forming apparatus have and the as many developing machine of toner color number and photosensitive drums, and are transferred to successively on image conveyer belt and recording medium by different color images.
For this tandem type image forming device, in order to improve the stability of picture quality, the specific patterns such as such as greyscale pattern are printed on the recording mediums such as such as paper after the pre-heat treatment by known method between the starting period.More particularly, the method utilizes the image-reading devices such as such as scanner to read the greyscale pattern printed, then based on this pattern adjustment image forming conditions, as gamma corrected.But problem is the current potential for photosensitive drums, and the attachment characteristic of charge image developing toner may change along with the time.As a result, best image forming conditions can not keep.In order to overcome this problem, traditionally, use the relation between potential data and concentration to carry out concentration calibration, be formed on the non-image forming region of photosensitive drums with the color lump that the monochrome of C, M, Y and K is developed (patch).These color lumps formed are read by optical sensor.The output utilizing predetermined concentration translation table optical sensor to obtain, the concentration then its value being used for the LUT of the one dimension gray correction using gamma corrected controls.
In another field of electrophotographic image-forming apparatus in recent years, particularly in printing speed industrial circle, need higher picture quality.The color balance of color image forming is usually according to treatment conditions and the environmental changes caused by the heating of fixation unit or the adjustment of pressed temperature such as the laser explosure amount on such as optical conductor and developing bias or change over time.Due to these changes, the above-mentioned calibration controlling to carry out for concentration will be inadequate, even if because utilize the above-mentioned LUT for one dimension gray correction to have adjusted single color gradation feature, need " blend color " of multiple toner, as the red, green, blue set up by CMY and ash, also produce nonlinear difference according to the type of printer, this causes being difficult to guarantee to produce correct color.In order to overcome this problem, propose a kind of technology, this technology creates and exports chart, this chart has the blend color in scope that printer can reproduce, and utilize scanner or colour measurement unit to measure color, the color relatively recorded and desired value, finally produce corrected value (such as, see Japanese Unexamined Patent Publication 2006-165864 publication).
In addition, also proposed another kind of technology, target configuration file (destination profile) in this technical concerns ICC configuration file (ICC profile), and modifying target configuration file is to correct the color distortion in blend color.At this, ICC configuration file refers to the data defined by ICC (International ColorConsortium, international color consortium), and it is used to converting colors.First, this technology utilizes the chart of printer output blend color, then utilizes scanner or colour measurement unit to measure these colors.Upgraded three-dimensional LUT (target configuration file) can be corrected blend color by the difference that calculates between measurement result and desired value, wherein the device independent color space (L*a*b*) of ICC configuration file is converted to device dependent color spaces (CMYK) by three-dimensional LUT.L*a*b* is one of device independent color space, and wherein L* represents brightness, and a*b* represents form and aspect and colourity respectively.Test the blend color color lump on the color sensor reading & recording medium that utilizes this to pass in principle to be arranged between fixing region and ADF region in paper transport path, with controlled concentration or color.In addition, the datum plate (hereinafter also referred to as " blank ") for calibrating color sensor can be arranged on the front of each color sensor, to calibrate color sensor, thus improves their reading accuracy.
But even if utilize this technology, when color sensor or blank are placed in the paper transport path between fixing region in image forming apparatus and ADF region, color sensor and blank also may coming off or dust and contaminated due to toner.In the case, attendant will be apprised of and make mistakes, and he must clean, more both emat sensor and blank.When processing this mistake; if do not know which in transducer or blank is contaminated; then attendant is by both needs replacing, cleaning sensor and blank, and this needs the more time more to change jobs and prepares the parts of needs replacing, causes downtime frequently.In Japanese Unexamined Patent Publication 2008-298854 publication, disclose a kind of technology for overcoming this problem, wherein optical pickocff reads the optical concentration as optical reflection feature of the detection toner image be formed on middle transfer body.Then the technology of Japanese Unexamined Patent Publication 2008-298854 publication forms the benchmark image pattern of white colour material on middle transfer body, and based on this benchmark image correcting pattern optical pickocff.Like this, can determine that color sensor is contaminated or middle transfer body is contaminated by reading benchmark image pattern.In addition, any datum plate calibrated is not needed.In addition, the color detection precision of transducer can be improved, control for better image color.
But in No. 2008-298854, above-mentioned Japanese Unexamined Patent Publication, use toner to form multiple benchmark image pattern, the concentration of these patterns is used to determine that contaminated is color sensor or middle transfer body.Therefore, considerable toner is correspondingly consumed.In addition, owing to not carrying out the calibration using datum plate in the starting stage, so the reading of color sensor also can be caused to occur another problem of error, this causes the calibration accuracy of concentration and color to decline.
Summary of the invention
The present invention relates to the image forming apparatus solving the problems referred to above, this image forming apparatus has: multiple color sensor, datum plate, it is for regulating the output characteristic of described multiple color sensor, reading unit, it obtains the result of the reading of described datum plate as the first color sensor in the middle of described multiple color sensor for working as, when difference between the predetermined absolute value of described datum plate and the reading of described datum plate read by described first color sensor is greater than predetermined threshold, make the concentration of described first color sensor and the second color sensor reading & recording medium different from described first color sensor, wherein, difference between described predetermined absolute value and the reading of described datum plate read by described second color sensor is less than described predetermined threshold, determining unit, when it is less than described predetermined threshold for the difference between the reading and the reading of described recording medium read by described second color sensor of the described recording medium read by described first color sensor, determine to there is exception in described datum plate, and notification unit, it is for notifying described determination result.
According to various embodiments of the present invention, between the alignment epoch of concentration and color, can wrong factor in identification sensor or datum plate, and do not waste toner when processing mistake, thus the maintainability of image forming apparatus can be improved.In addition, when mistake appears in datum plate, color sensor can corrected concentrations and color exactly, thus can reduce the downtime of image forming apparatus.
By following (with reference to the accompanying drawing) description to exemplary embodiment, other features of the present invention will become clear.
Accompanying drawing explanation
Fig. 1 is the view that relation between Figure 1A and Figure 1B is shown;
Figure 1A is the flow chart illustrated according to the concentration of embodiment 1 and 2 and the example calibration process of color;
Figure 1B is the flow chart illustrated according to the concentration of embodiment 1 and 2 and the example calibration process of color;
Fig. 2 illustrates the figure changed according to the toner concentration during calibration process of embodiment 1 and 2;
Fig. 3 is the figure that inversion process result in the concentration calibration process according to embodiment 1 and 2 is shown;
Fig. 4 is the view that relation between Fig. 4 A and Fig. 4 B is shown;
Fig. 4 A be illustrate according to embodiment 1 with 2 with the block diagram producing the relevant parts of electrostatic latent image;
Fig. 4 B be illustrate according to embodiment 1 with 2 with the block diagram producing the relevant parts of electrostatic latent image;
Fig. 5 is the sectional view of the image forming apparatus according to embodiment 1 and 2;
Fig. 6 is the figure of the parts of the color sensor of the image forming apparatus illustrated according to embodiment 1 and 2;
Fig. 7 is the figure of the parts of the color sensor of the image forming apparatus illustrated according to embodiment 1 and 2;
Fig. 8 is the figure of the exemplary UI display of the image forming apparatus illustrated according to embodiment 1 and 2;
Fig. 9 is the figure of the exemplary UI display of the image forming apparatus illustrated according to embodiment 1 and 2;
Figure 10 is the figure of the exemplary UI display of the image forming apparatus illustrated according to embodiment 1 and 2;
Figure 11 is the figure of the exemplary UI display of the image forming apparatus illustrated according to embodiment 1 and 2;
Figure 12 is the view that relation between Figure 12 A and Figure 12 B is shown;
Figure 12 A is the form for pollution cause of classifying according to embodiment 2;
Figure 12 B is the form for pollution cause of classifying according to embodiment 2; And
Figure 13 is the flow chart illustrated according to the concentration of embodiment 2 and the example calibration process of color.
Embodiment
Various embodiment of the present invention is described below with reference to accompanying drawings.Fig. 4 illustrate illustrate the following examples 1 with in the electronic photograph color image forming device of 2 with the block diagram producing the relevant parts of electrostatic latent image.This color image forming comprises image formation unit 403 and graphics processing unit 402.Graphics processing unit 402 produces bitmap images information, and image formation unit 403 forms image on the recording medium based on produced image information.
Controller 401 is connected to scanner (not shown) or image-input device and printer 402 or image output device.Controller 401 by being connected to the network of such as LAN or common line (not shown), can also input or output image or device information.System bus 101 includes but not limited to the high-speed bus of such as pci bus or IEEE 1394.At this, in order to the simplification explained, Fig. 4 only illustrates the device relevant with embodiment.Such as, system bus 101 can be connected to network needed for MFP (not shown) or scanner interface, and this will be readily apparent to persons skilled in the art.
CPU 102 is as the controller for controlling whole digital copy machine.RAM 104 is used as the system working memory for operating CPU 102, and is used as the video memory for temporarily storing image data.ROM 103 is used as guiding ROM, and stores the boot of this digital copy machine.External memory interface 105 is such as the external memory interface of HDD, and can the data of read/write store in external memory 106.
External memory 106 is external memory storages, as HDD, DDR3 memory and NAND flash memory, and storage system software, view data and personal data, as address book, and the color lump pattern needed for embodiment.Device interface 107 can communicate with image formation unit 403 with graphics processing unit 402, to send print execution order and transferred image data, and can read engine status.
The process of graphics processing unit 402 in this color image forming is described below.Image generation unit 404 generates printable raster image data based on the print data received from computer installation (not shown), and exports the attribute data of the RGB data of each pixel and the data attribute of this pixel of appointment.At this, image generation unit 404 can comprise reading unit in this color image forming, and to receive be not from computer installation but from the view data of this reading unit.The term reading unit used in the text refers to and such as utilizes CCD (charge coupled device) or CIS (contact-type image sensor) reading images and the device exporting their signal.This color image forming can also comprise the processing unit for carrying out predetermined image task for read view data.As selection, this equipment can read from another reading unit via interface (not shown), and can not have reading unit in this coloured image device.
Above-mentioned RGB data is converted to cmyk data in the mode meeting the toner color of graphics processing unit 402 by color conversion unit 405.In addition, the 4D-LUT being used for correcting blend color carries out color conversion.At this, 4D-LUT is defined as CMYK being converted to the different four-dimensional LUT of.4D-LUT can correct the blend color by using multiple toner to produce.To the details producing and be used for the 4D-LUT correcting blend color be described below.CMYK and attribute data are stored in bit image memory 406.The first memory cell 406 as bit image memory be included in graphics processing unit 402 stores the raster image data for print processing temporarily.At this, the first memory cell 406 can be the page storage of the view data for memory page, or for storing the tape storage of multirow data.
Halftone processing unit 407C, 407M, 407Y and 407K data to the attribute data exported from the first memory cell 406 and each color carry out gamma corrected and halftoning.Carry out gamma corrected with by concentration calibration to desirable gamma characteristic.The concrete configuration of halftone processing unit comprises screen process or error diffusion process.Screen process uses the view data of multiple predetermined dither matrix to input to carry out N system code, and error diffusion process carries out N system code by the view data and predetermined threshold value comparing input to the view data inputted, and difference be wherein diffused into will by the surrounding pixel of N system code.
Second memory cell 408 is included in this image forming apparatus, and stores the N binary data of being encoded by halftone processing unit 407 (407C, 407M, 407Y and 407K).Color lump tern generation unit 409C, 409M, 409Y and 409K correspond respectively to each color, and generate the color lump pattern that its concentration and color need to be corrected, and this pattern is sent to transmission buffer described below.Should be understood that, fixing and the color lump pattern for concentration and color calibration be formed on recording medium 11 comprises multiple pattern by color lump tern generation unit 409, as having the gray scale color lump of the single color of the K gray scale color lump of close colourity, CMY process gray scale color lump or CMYK, and be used to their object.Best color lump pattern is selected by controller 401, and is generated by the screen pattern be stored in advance in external memory unit 106.As selection, replace reading from memory cell, internal logic can prepare and generate this best color lump pattern.As described below, the position that can read with color sensor and size generate color lump pattern.
Timing adjustment module 410C, 410M, 410Y and 410K are configured to make to export the data of N system code from memory cell 408 and export the timing of data from color lump tern generation unit 409 synchronous with the operation of image formation unit 403.Transmit the output data that buffer 411C, 411M, 411Y and 411K keep timing adjustment module 410 temporarily.
Pwm unit (PWM:Pulse Width Modulation) 412 will be converted to the time for exposure of laser from the view data transmitting each color that buffer 411 exports.Export the view data after conversion from the print unit of image formation unit 403, make this view data by scanner unit 414C, 414M, 414Y and 414K exposure to form color lump pattern image.Color lump pattern data 415C, 415M, 415Y and 415K of exporting are used to corrected concentrations and color.External memory unit 106 provides the various pattern datas corresponding with the number of the gray scale that halftone processing unit 407C, 407M, 407Y, 407K carry out and halftone process.These pattern datas are read in color lump tern generation unit 409C, 409M, 409Y and 409K of graphics processing unit 402 via device interface 107.
Should be understood that, although in this article external memory unit 106, first memory cell 406, second memory cell 408 and transmission buffer 411 are described to parts separately, common memory cell can be provided in this image forming apparatus inside or outside.
Image formation unit 403 produces exposure according to the time for exposure calculated by graphics processing unit 402, is then formed and developing electrostatic latent image, to produce the toner image of single color.In addition, the toner image of this blend color with the toner image producing blend color, and is transferred to the recording medium 11 of Fig. 6 by overlapped for these toner images by this unit, with by the toner image of this blend color on the recording medium.
Fig. 5 is the sectional view of the tandem color image forming apparatus 20 of an example as electronic photograph color image forming device 20, this equipment adopts middle transfer body 28, and Fig. 6 and Fig. 7 illustrates the parts of the color sensor of tandem color image forming apparatus 20.The operation of the image formation unit 403 of electronic photograph color image forming device 20 is extremely described with 7 with reference to Fig. 5.Sleeve pipe 23YS, 23MS, 23CS and 23KS be equipped with as charged elements, respectively for making Electrifier frame, photoreceptor 22Y, 22M, 22C and 22K of each color of Y, M, C and K charged four pouring-in charged device 23Y, 23M, 23C and 23K.
Photosensitive drums 22Y, 22M, 22C and 22K rotation is made by the actuating force sent from CD-ROM drive motor 40Y, 40M, 40C and 40K.Described CD-ROM drive motor is such as rotated counterclockwise photosensitive drums 22Y, 22M, 22C and 22K according to image forming operation.As exposing unit, scanner unit 24Y, 24M, 24C and 24K are configured to utilize Exposing Lamp optionally to irradiate photosensitive drums 22Y, 22M, 22C and 22K, and expose it respectively, to form electrostatic image on the surface of these photosensitive drums.Can include but not limited to utilize multiple Exposing Lamp to irradiate the multi-laser beam of photosensitive drums according to the scanner unit 24Y of the present embodiment, 24M, 24C and 24K.
Be equipped with four of sleeve pipe 26YS, 26MS, 26CS and 26KS developing apparatus 26Y, 26M, 26C and 26K to be provided as developing cell respectively, to develop to each color of Y, M, C and K respectively, thus make above-mentioned electrostatic image visual.Although it should be pointed out that such as in order to maintainability, each developing apparatus 26 of the present embodiment is dismountable, and these developing apparatus are not limited to this configuration.
Middle transfer body 28 as transfer printing unit turns clockwise, and makes middle transfer body 28 can from photosensitive drums 22 transfer printing monotone toner image.Photosensitive drums 22Y, 22M, 22C and 22K and primary transfer roller 27Y, 27M, 27C and 27K relative with drum rotate with transfer printing monotone toner image.By applying suitable bias voltage to primary transfer roller 27 and making the rotary speed of photosensitive drums 22 different from the rotary speed of middle transfer body 28, this monotone toner image can be transferred on middle transfer body 28 effectively.This mechanism is called as primary transfer.
In addition, monotone toner image covers on middle transfer body 28 by this transfer printing unit, to produce blend color toner image, then utilizes the rotation of middle transfer body 28 that blend color toner image is sent to secondary transfer roller 29.
In addition, recording medium 11a, 11b, 11c and 11d are each to be clamped and is sent to secondary transfer roller 29 by from paper feeding plate 21a, 21b, 21c and 21d respectively, is transferred on recording medium 11 by the blend color toner image on middle transfer body 28 at this.By applying suitable bias voltage to secondary transfer roller 29, the toner image of the static electrification of toner is transferred to roller 29.This process is called as secondary transfer printing.When being transferred on recording medium 11 by the toner image of blend color, secondary transfer roller 29 is against on medium 11 at 29a place, position, then arrive 29b place, position and medium 11 spaced apart.
Be provided for adding the fixing roller 32 of thermal recording media 11 and the pressure roll 33 for making medium 11 crimp with fixing roller 32, make fixation unit can will be transferred to medium 11 blend color toner image fusing and fixed thereon.Fixing roller 32 and pressure roll 33 are formed hollow shape, and have built-in heater 34 and 35 respectively.Fixing device 31 uses fixing roller 32 and pressure roll 33 to transmit recording medium 11 with blend color toner image, and applies heat and pressure to medium 11, and toner is fixed on medium 11.
For duplex printing, the recording medium 11 it being fixed with toner is sent to delivery unit 60, and is discharged into ADF dish 62a, 62b and 62c by exit roller 61, thus terminates image forming operation.As selection, medium 11 can be clamped and is again sent to secondary transfer roller 29 via inner transfer path.Print for one side, this medium is discharged into ADF dish 62a, 62b and 62c, thus terminates image forming operation.
Clearing cell 30 removes toner residual on middle transfer body 28.The used toner produced after being transferred on recording medium 11 by the mixing toner image of four colors be formed on middle transfer body 28 is deposited in remover container (not shown).
As shown in Figure 7, color sensor 50a, 50b, 50c and 50d comprises White LED 51a, 51b, 51c and 51d and has charge accumulation transducer 52a, 52b, 52c and 52d of RGB colour filter on sheet.As shown in figures 6 and 7, light from LED 51a, 51b, 51c and 51d incides the recording medium 11 it being formed with fixing color lump with miter angle, and transducer 52a, 52b, 52c and 52d are in the intensity that diffuses of 0 degree of angle detecting from medium 11.The light receiving unit of transducer 52a, 52b, 52c and 52d has the pixel of independently R, G or B.Transducer 52a, 52b, 52c and 52d also can be photodiodes.Transducer can be formed by arranging several groups of rgb pixels.In addition, incidence angle and angle of reflection can be set to 0 degree and 45 degree respectively.In addition, the LED launching RGB tri-colors can be utilized and do not have the transducer of colour filter to configure the sensor.
Color sensor 50a, 50b, 50c and 50d are configured to the image formation surface of the recording medium 11 on the recording medium transfer path between fixation part in this image forming apparatus and paper ejection part.This transducer detects the color of the fixing blend color color lump be formed on recording medium 11, and exports its rgb value.This configuration in this image forming apparatus allows automatically to detect this color lump color before fixing image is discharged into paper ejection part.In Figure 5, this transducer configures in their modes that can read through the recording medium 11 of two-sided transfer path 60 and forms.
Datum plate (blank) 53a, 53b, 53c and 53d have XYZ absolute value.Color sensor 50a, 50b, 50c and 50d can obtain with them the colourity that is positioned at datum plate 53a, 53b, 53c and the 53d in transducer front when recording medium 11 is not on two-sided transfer path 60 or the mode of concentration that obtains from colourity configures and forms.Although it should be pointed out that Fig. 6 illustrates four couples of color sensors 50a, 50b, 50c and 50d described below and datum plate 53, color sensor and the datum plate pair of arbitrary number can be set, make it possible to the colourity and the concentration that obtain recording medium 11 concurrently.
In addition, color sensor 50a, 50b, 50c and 50d can obtain the absolute value (that is, Absolute Colorimetric or the absolute concentration that calculates from Absolute Colorimetric) of recording medium 11 by reading datum plate 53a, 53b, 53c and 53d.The rgb value exported from the color lump pattern generated at color lump pattern generating unit 409 is general in a continuous manner along with gray scale change.Therefore, Mathematical treatment is carried out to the RGB output valve of given gray scale and adjacent gray scale, as linear approximation or second approximation, can RGB output valve between the gray scale that arrives of predicted detection.Color lump data are converted to the signal of telecommunication by color sensor 50a, 50b, 50c and 50d, then carry out analog/digital conversion to this signal of telecommunication and are sent to the CPU 102 of controller with L*a*b* via device interface 107.The Data classification recorded is color and achromaticity color by CPU 102.
Above-mentioned classification can pre-recorded when producing color lump data be colored with these data or achromatic relevant information, or color lump data or the reading of data that records can be analyzed to judge that color lump data are colours or achromatic.Then CPU 102 uses this reading and the three-dimensional LUT of fiducial value calibration for L*a*b* being converted to CMY, and exports the 3D-LUT after calibration.At this, this fiducial value refers to target L*a*b* value, and utilizes color and each fiducial value of achromaticity definitions of color.For L*a*b* being converted to the LUT that the 3D-LUT of CMY is the color for changing the known technology generation of use, it is the data describing the intrinsic CMY value of the device corresponding with RGB or the L*a*b* value defined at certain intervals in cancellate mode.Difference operation is carried out to any one L*a*b* value, and is exported as corresponding CMY value.Finally, CPU 102 uses 3D-LUT, the 3D-LUT of calibration and device information to produce 4D-LUT for being converted to CMYK from CMYK, and utilizes 4D-LUT to carry out calibration operation.
The term device information used in the present embodiment represents the amount of the toner that can be applied by image formation unit 20, and is called as in this article " applied amount ".Such as, for CMYK, if the maximum of single color is set to 100%, then the signal value up to 400% can be set in theory, and if the whole of the toner that can apply are set to 300%, then applied amount is also 300%.
Fig. 2 illustrates concentration output characteristic, and its instruction is by reading the change of the toner image density of the color lump pattern acquisition exported.CPU 102 uses the change of concentration, the concentration of reference object and the curve detected and the device characteristic received to carry out inverse transformation, makes the image color of the output of picture signal linearly corresponding.Fig. 3 illustrates the result of the linear gauging of the concentration utilizing this inverse transformation to draw.The gamma LUT be stored in halftone processing unit 407C, 407M, 407Y and 407K will be corrected.To it should be pointed out that in the change in concentration amount of calibrator quantity and the toner image that will be reflected to gamma LUT and the initialization sequence of basic concentration after power supply is connected or after a certain time period corrected concentrations and color time produce in advance.Produce gamma LUT when predetermined correction of timing concentration and color, and carried out the calibration of gamma LUT by the toner image density comparing gamma LUT and reading.
The calibration of concentration or color can be carried out in color image forming by above-mentioned process.
First embodiment
Form system according to the example images of above-mentioned process and there are four color sensors 50a, 50b, 50c and 50d being set up in parallel, the multiple pattern concentration on reading & recording medium on main scanning direction 11.Datum plate is read by color sensor 50a, 50b, 50c and 50d when corrected concentrations and color.Flow chart referring to Fig. 1 describes the faulty operation of carrying out when the colourity of datum plate or the absolute value of concentration exceed predetermined threshold value.
Between the starting period after returning from dormancy, after certain operating time section or after the image defining some, CPU 102 starts corrected concentrations or color.In step S101, the colourity of datum plate 53a, 53b, 53c and 53d or the result of concentration that measure opposite are informed to CPU 102 by color sensor 50a, 50b, 50c and 50d.Then this flow process proceeds to step S102.The absolute value of the result absolute value calculated and datum plate 53a, 53b, 53c and 53d of prestoring of receiving from step S101 is compared in step S102, CPU 102.Then this flow process proceeds to step S103.Step S103, CPU 102 step S102 relatively after judge whether the difference between these two absolute values is greater than predetermined threshold value.If be greater than, then CPU 102 is judged as existing extremely, and memory allocation is to the numbering being judged as abnormal transducer 50, as 50a, 50b, 50c or 50d.Then this flow process proceeds to step S105.If be not more than, then CPU 102 is judged as that color sensor is normal.Then this flow process proceeds to step S104.
In step S104, CPU 102 based on the difference obtained in step S102, the output of color sensor 50a, 50b, 50c and 50d is calibrated to respectively the absolute value of datum plate 53a, 53b, 53c and 53d.Then this flow process proceeds to step S105.Judge whether that all colours transducer 50a, 50b, 50c and the 50d arranged is completed above-mentioned steps S101 to S104 in step S105, CPU 102, if be completed, then this flow process proceeds to step S106.If also have color sensor do not complete above-mentioned steps, then CPU 102 return step S101 and for do not have completing steps S101 to S104 transducer repeat above-mentioned steps.In step S106, any one judging whether in color sensor 50a, 50b, 50c and 50d exists abnormal in step S103, if not, then this flow process proceeds to step S107; Otherwise, proceed to step S110.
Color lump pattern generating unit 409C, 409M, 409Y and 409K is configured to produce multiple briliancy color lump of predetermined K gray scale and the gray scale color lump of CMY mixed processing in step S107, CPU 102.In the configuration, based on the operation carried out after calibration last time, according to the color of the color lump pattern that will be corrected its concentration or color, gray scale and halftone process, select types of patterns.CPU102 also configures timing adjustment module 410C, 410M, 410Y and 410K navigate to color sensor 50a, 50b, 50c and the 50d arranged on main scanning direction respectively coordinate with the above-mentioned color lump pattern that will produce.CPU 102 configures these timing adjustment module further to export these color lumps according to antiquarian on vertical scanning direction.Utilize above-mentioned configuration, described color lump is printed, and forms toner image on middle transfer body 28.
In step S108, after carrying out analog/digital conversion to the signal value of the toner image reading formed from step S107, this signal value is sent to the CPU 102 of controller 401 by color sensor 50a, 50b, 50c and 50d via device interface 107.The signal value extracting concentration that CPU 102 reads from the transducer being placed in described coordinate in step S107.Then this flow process proceeds to step S109.3D-LUT after step S109, CPU 102 uses 3D-LUT, conversion as mentioned above and device information produce the 4D-LUT for being transformed into CMYK from CMYK, and carry out color calibration.In addition, CPU 102 carries out concentration calibration to complete color or concentration calibration for gamma LUT.
Select any one recording medium 11a, 11b, 11c or 11d in step S110, CPU 102 from paper feeding plate 21a, 21b, 21c or 21d, and send it to two-sided transfer path 60 via secondary transfer roller 29.At this, this recording medium is preferably chosen as makes color sensor 50a, 50b, 50c and 50d stably can read white from this medium.Such as, the recording medium of low transparency and heavy basis weight (standard weights of Paper or cardboard, it is defined as their weight of every square metre) is usually selected to have.Or, the paper that the recording medium beyond the coated paper of high reflectance and chromatics paper or user select in advance can be selected.Or, the recording medium for next operation can be selected and again it is sent to secondary transfer roller 29 from two-sided transfer path.After the selection completing recording medium, this flow process proceeds to step S111.
In step S111, color sensor 50a, 50b, 50c and 50d read in the concentration on coordinate described at least one on recording medium 11 surface that is that step S110 selects or selectivity transmission, and this concentration is sent to CPU 102.Then this flow process proceeds to step S112.In step S112, CPU 102, the judgement of comparing in the middle of the result sent in step S111 is the reading of abnormal transducer and the reading being judged as normal transducer.Then this flow process proceeds to step S113.The difference that obtains from the comparison of step S112 is judged whether within predetermined threshold value in step S113, CPU 102.If within the threshold value that this is predetermined, then this flow process proceeds to step S118; Otherwise this flow process proceeds to step S114.
Judge to be judged as that abnormal color sensor is abnormal in step S103 in step S114, CPU 102, and as shown in Figure 8, abnormality warnings message is presented on UI, or via e-mail this message is sent to user.As selection, this message such as can send to technical staff via e-mail.Then this flow process proceeds to step S115.When also having other normal transducer, show the information that whether should only use these transducers to carry out calibrating (shrinking back) to process in step S115, CPU 102.If user selects to carry out this process of shrinking back, then this flow process proceeds to step S116.Otherwise this calibration process terminates.
This process of shrinking back is configured in step S116, CPU 102.Usually, color lump pattern is generated as and makes them evenly distributed on recording medium 11 for the coordinate of color sensor 50a, 50b, 50c and 50d.But CPU 102 changes the order that the color lump pattern on the coordinate of the abnormal color transducer detected in step S114 is read by other transducer.At this, CPU 102 configures color lump pattern generating unit 409C, 409M, 409Y and 409K to switch color lump pattern around, makes them be classified as similar color.As selection, CPU 102 can configure these unit to remove the color lump pattern of achromatic or monochrome except those monochromes being positioned at color space periphery, to reduce the number of time or recording medium.Then this flow process proceeds to step S117.
Image generation unit 404 indicating color block pattern generating unit 409C, 409M, 409Y and 409K is allowed to produce color lump pattern they to be formed on recording medium 11 in step S117, CPU 102.Then this flow process proceeds to step S118.In step S118, CPU 102 determines also to be confirmed as in step S103 abnormal abnormal with the datum plate 53 arranged in the face of the mode of color sensor, and as shown in Figure 9 abnormality warnings message is presented on UI, or via e-mail this message is sent to user.As selection, such as, by Email, this message can be sent to technical staff.Then this flow process proceeds to step S119.
Inquire whether user calibrates together with other normal transducer, because do not calibrate the color sensor of exception in step S103 in step S119, CPU 102.When being judged as that in step S119 the reading of normal multiple transducer alters a great deal, CPU 102 can be judged as that the white of recording medium is not suitable for calibration, and does not select it to calibrate.If user selects to perform calibration, then this flow process proceeds to step S120.If user selects not perform calibration, then this flow process proceeds to step S116, as step S103 judge there is no normal transducer, or recording medium is judged as inappropriate.
The difference between the determined abnormal and reading of normal color sensor of step S103 is obtained from the reading of the recording medium 11 read in step S111 and S112 in step S120, CPU 102.CPU 102 uses this difference to arrange the coefficient of the reading for the reading of abnormal color transducer being corrected to normal color transducer.Then this flow process proceeds to step S107.
Above-mentioned flow process can to identify in abnormal transducer or datum plate any one wrong factor during calibrating concentration and color when processing mistake.In addition, when mistake appears in datum plate, color sensor can be utilized to complete concentration and color calibration more accurately.
Second embodiment
In above-mentioned image formation system, be provided with four color sensors 50a, 50b, 50c and 50d, each transducer 50 can read datum plate 53a, 53b, 53c and 53d faced by correspondence when calibrating concentration and color.The number that difference between the reading of each transducer 50 and the absolute value of datum plate 53 exceedes predetermined threshold is counted.The error handling procedures of this number is used referring to the flow chart in Fig. 1 and Figure 13 and the form description in Figure 12.Described in these figure, in a second embodiment, the process that the step S112 in the middle of step in a flow diagram in figure 1 and S113 will carry out except the detailed process described in the first embodiment.Therefore, by the explanation of those steps similar with the step in the first embodiment beyond omission step S112 and S113.In step S112, the details of process generally depends on unit state.Specifically, in step S112, according to the exception of device, by different values compared with the reading of transducer.In other words, step S112, CPU 102 by any one in value described below be judged as that in step S103 the reading of the recording medium 11 that abnormal color sensor 50a, 50b, 50c and any one in 50d read is compared.Illustrated in Figure 13 this read-around ratio compared with details.
With reference to Figure 13, count the number being judged as abnormal color sensor in step S103 in step S201, CPU 102.Then this flow process proceeds to step S202.The number of number and the set color sensor counted in step S201 is compared in step S202, CPU 102.If they are equal, this is situation c in the form of Figure 12, d, e, f and g, then this flow process proceeds to step S203; Otherwise this flow process proceeds to step S208.
The reading whether normal transducer keeps the recording medium 11 of current selection is judged as in the calibration that step S203, CPU 102 judges in upper once concentration and color.If do not kept, then this flow process proceeds to step S204; Otherwise this flow process proceeds to step S207.Judge whether this transducer keeps by user or the pre-configured predicted value of technical staff in step S204, CPU 102.If do not kept, then this flow process proceeds to step S205; Otherwise this flow process proceeds to step S206.
If this predicted value is not configured, then stop calibration process in step S205, CPU 102, and circulate a notice of any one contaminated message in color sensor or datum plate, and terminate this flow process.Compare reading and the predicted value of the recording medium 11 read by transducer in step S206, CPU 102, then terminate this flow process.Compare in step S207, CPU 102 reading of the recording medium 11 read by transducer and transducer normal time reading, then terminate this flow process.
Compare by being judged as the reading that abnormal transducer reads in step S103 and by being judged as the reading that other transducer normal reads, then terminating this flow process in step S208, CPU 102.In the case, abnormal alarm message is presented on UI as shown in Figure 11, or sends to user via e-mail.As selection, such as, via e-mail this message can be sent to technical staff.
As mentioned above, the relation be arranged in the middle of the number of the color sensor in this image forming apparatus and these transducers between the number that step S103 is judged as abnormal transducer provides classification form as shown in Figure 12.Whether object relatively can keep based on this relation and transducer will this object compared with the reading be stored in transducer and changing.
Such as, when being provided with multiple color sensor and the number of described multiple color sensor is equal with the number of abnormality sensor (namely, situation a in Figure 12, b and c), in step S112, compared with reading time normal to the reading of these transducers and transducer or predicted value.On the other hand, if the number of abnormality sensor is less than the sum of set color sensor, (that is, the situation d in Figure 12, e and f), then the reading of other normal transducer of CPU 102 prioritizing selection is as comparison other.As a result, CPU 102 can step S113 judgment standard plate, color sensor or both whether contaminated.If CPU judges that the two is all contaminated, then abnormal alarm message is presented on UI as shown in Figure 10, or sends to user via e-mail.As selection, such as, via e-mail this message can be sent to technical staff.These two steps of step S118 and S114 will be carried out in the case.
If be only provided with a color sensor, then as described above, CPU 102 using the reading of transducer when selecting the transducer that keeps normal or predicted value as comparison other.If the comparison of step S113 causes difference (that is, the situation g in Figure 12) within predetermined threshold value, then CPU 102 judges that datum plate is contaminated.Then this flow process proceeds to step S118.If this difference is (that is, the situation h in Figure 12) not within this threshold value, then CPU 102 judges that color sensor is contaminated.Then this flow process proceeds to step S114.
Should be understood that, the reading of the recording medium 11 that above-mentioned nominal sensor has read and be stored in memory device by user or the pre-configured predicted value of technical staff, as in RAM 104 or external memory unit 106, and can read from this memory device when needed.
Above-mentioned flow process can to identify in abnormal transducer or datum plate any one wrong factor during calibrating concentration and color when processing mistake.In addition, when mistake appears in datum plate, color sensor can be utilized to complete concentration and color calibration more accurately.
Other embodiment
Each aspect of the present invention can also by read and the system of program of the executive logging function for performing above-described embodiment on a storage device or the computer (or equipment of such as CPU or MPU) of device realize, and by the computer by system or device by such as to read and the method that the executive logging program for the function performing above-described embodiment on a storage device performs each step realizes.Given this, such as program is provided via network or from the various types of recording mediums (such as computer-readable medium) being used as memory device to computer.
Although with reference to exemplary embodiment, invention has been described, should be appreciated that the present invention is not limited to disclosed exemplary embodiment.The widest explanation should be given to the scope of claims, contain all these modified examples and equivalent 26S Proteasome Structure and Function to make it.
Claims (11)
1. an image forming apparatus, it comprises:
Multiple color sensor;
Datum plate, it is for regulating the output characteristic of described multiple color sensor;
Reading unit, it obtains the result of the reading of described datum plate as the first color sensor in the middle of described multiple color sensor for working as, difference between the predetermined absolute value of described datum plate and the reading of described datum plate read by described first color sensor is greater than predetermined threshold, and the result of the reading of described datum plate is obtained as second color sensor different from described first color sensor in the middle of described multiple color sensor, when difference between the predetermined absolute value of described datum plate and the reading of described datum plate read by described second color sensor is less than predetermined threshold, described first color sensor and described second color sensor is made to read the concentration selecting the surface of the paper of kind in advance,
Determining unit, when it is less than predetermined threshold for the difference between the reading and the reading of described paper read by described second color sensor of the described paper read by described first color sensor, determine to exist extremely in described datum plate, and the difference between the reading and the reading of described paper read by described second color sensor of the described paper read by described first color sensor is when being greater than predetermined threshold, determine to exist in described first color sensor exception; And
Notification unit, it is for notifying described determination result.
2. image forming apparatus according to claim 1, wherein, select and the paper transmitting the kind of being specified by user as the described paper selecting kind in advance.
3. image forming apparatus according to claim 1, wherein, selects and transmits with the paper of the paper identical type for printing next time as the described paper selecting kind in advance.
4. image forming apparatus according to claim 1, wherein, if obtain the result of the reading of described datum plate as whole described multiple color sensors, difference between the predetermined absolute value of described datum plate and described reading is greater than predetermined threshold, then described determining unit carries out describedly determining based on the difference between the reading of described paper read by described first color sensor and predetermined predicted value.
5. image forming apparatus according to claim 1, wherein
The reading of the described datum plate read by described first color sensor is kept, and
If obtain the result of the reading of described datum plate as whole described multiple color sensors, difference between the predetermined absolute value of described datum plate and described reading is greater than predetermined threshold, then described determining unit carries out describedly determining based on the difference between the reading of described paper read by described first color sensor and the reading kept.
6. image forming apparatus according to claim 1, wherein, if the result of the reading as the described datum plate of acquisition, the difference between described predetermined absolute value and described reading is less than predetermined threshold, then described first color sensor is calibrated, and makes described reading close to described predetermined absolute value.
7. image forming apparatus according to claim 1, wherein
Described first color sensor uses first datum plate corresponding with described first color sensor to adjust its output characteristic,
Described second color sensor uses second datum plate corresponding with described second color sensor to adjust its output characteristic, and
If described first datum plate is confirmed as exception, then uses the coefficient obtained according to the reading of the described paper read by described first color sensor and described second color sensor, calibrate described first color sensor.
8. image forming apparatus according to claim 1, described image forming apparatus also comprises alignment unit, described alignment unit performs calibration for using color sensor, and wherein, if described datum plate is confirmed as exception, and do not exist and be confirmed as other color sensor normal, then notify that described alignment unit can not perform calibration.
9. image forming apparatus according to claim 1, described image forming apparatus also comprises alignment unit, described alignment unit performs calibration for using color sensor, and wherein, if described first color sensor is confirmed as exception, then described alignment unit only uses and is confirmed as other transducer normal and performs calibration.
10. image forming apparatus according to claim 1, described image forming apparatus also comprises alignment unit, described alignment unit performs calibration for using color sensor, and wherein, if described first color sensor is confirmed as exception, and do not exist and be confirmed as other color sensor normal, then notify that described alignment unit can not perform calibration.
The control method of 11. 1 kinds of image forming apparatus, this image forming apparatus has multiple color sensor and for regulating the datum plate of the output characteristic of described multiple color sensor, described control method comprises the following steps:
When obtaining the result of the reading of described datum plate as the first color sensor in the middle of described multiple color sensor, difference between the predetermined absolute value of described datum plate and the reading of described datum plate read by described first color sensor is greater than predetermined threshold, and the result of the reading of described datum plate is obtained as second color sensor different from described first color sensor in the middle of described multiple color sensor, when difference between the predetermined absolute value of described datum plate and the reading of described datum plate read by described second color sensor is less than predetermined threshold, described first color sensor and described second color sensor is made to read a kind of concentration of surface of the paper selected in advance,
When difference between the reading and the reading of described paper read by described second color sensor of the described paper read by described first color sensor is less than predetermined threshold, determine to exist extremely in described datum plate, and the difference between the reading and the reading of described paper read by described second color sensor of the described paper read by described first color sensor is when being greater than predetermined threshold, determine to exist in described first color sensor exception; And
Notify described determination result.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011-193283 | 2011-09-05 | ||
| JP2011193283A JP5797068B2 (en) | 2011-09-05 | 2011-09-05 | Image forming apparatus and method for correcting density and color |
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| CN102984431A CN102984431A (en) | 2013-03-20 |
| CN102984431B true CN102984431B (en) | 2015-07-08 |
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| CN201210323484.4A Expired - Fee Related CN102984431B (en) | 2011-09-05 | 2012-09-04 | Image forming apparatus and control method thereof |
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| US (1) | US8831443B2 (en) |
| JP (1) | JP5797068B2 (en) |
| CN (1) | CN102984431B (en) |
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| JP5797068B2 (en) * | 2011-09-05 | 2015-10-21 | キヤノン株式会社 | Image forming apparatus and method for correcting density and color |
| JP5990093B2 (en) * | 2012-11-29 | 2016-09-07 | キヤノン株式会社 | Image processing apparatus, image processing method, and program |
| JP6210271B2 (en) * | 2013-06-25 | 2017-10-11 | セイコーエプソン株式会社 | Correction method for printing data |
| JP6107548B2 (en) * | 2013-08-30 | 2017-04-05 | ブラザー工業株式会社 | Document reading apparatus and storage medium |
| JP6048449B2 (en) * | 2014-05-29 | 2016-12-21 | コニカミノルタ株式会社 | Image forming apparatus |
| JP6357906B2 (en) * | 2014-06-23 | 2018-07-18 | 富士ゼロックス株式会社 | Image reading apparatus and image forming apparatus |
| CN104462013B (en) * | 2014-06-26 | 2017-10-10 | 奥诚信息科技(上海)有限公司 | A kind of special asic chip system of optical triangle method |
| JP6484027B2 (en) * | 2014-12-24 | 2019-03-13 | キヤノン株式会社 | Image forming apparatus |
| CN107211067B (en) * | 2015-03-31 | 2020-11-24 | 惠普发展公司，有限责任合伙企业 | Correcting chromatic aberration between scanner modules |
| CA3022141A1 (en) * | 2016-05-27 | 2017-11-30 | Anthony P. Malanoski | Analyzing reflectance based color changes in sensing applications |
| JP6756171B2 (en) * | 2016-07-11 | 2020-09-16 | コニカミノルタ株式会社 | Image processing equipment, image forming equipment, image forming system, and image processing program |
| JP2018013703A (en) * | 2016-07-22 | 2018-01-25 | 京セラドキュメントソリューションズ株式会社 | Image forming apparatus |
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Also Published As
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| CN102984431A (en) | 2013-03-20 |
| JP2013054249A (en) | 2013-03-21 |
| JP5797068B2 (en) | 2015-10-21 |
| US8831443B2 (en) | 2014-09-09 |
| US20130058662A1 (en) | 2013-03-07 |
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